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vol. 13, nr. 3 (2009)
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Effect of surface cations on strongly bound water in alluvial soils
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Zofia Sokołowska, Piotr Bańka
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Institute of Agrophysics, Polish Academy of Sciences, ul. Doświadczalna 4, 20-290 Lublin |
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vol. 13 (2009), nr. 3,
pp. 781-779
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abstract:
In this paper we report on the results of investigations of adsorption of water on natural and modified alluvial soils, the latter with adsorbed K+, Na+, Ca2+ and Mg2+. The results are presented as sorption isotherms. All the isotherms belong to type II, according to the BET classification. The maximum hygroscopicity (Mh) and the water unavailable for plants (Wn) of natural and homoionic alluvial soils are estimated. The maximum hygroscopicity is equal to the amount of sorbed water at the relative pressure, p p0-1≈ 0.965. The water unavailable for plants is obtained from the results of the maximum hygroscopicity. Correlations between Mh, Wn and the energy of hydration of cations are calculated and relationships with some physicochemical soil characteristics, such as percentage of clay fraction and the cation exchange capacity, are found.
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keywords:
alluvial soil, water vapour sorption, surface cations, maximum hygroscopicity, water unavailable for plants
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original in:
Polish
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